公开(公告)号：US11172226B2

公开(公告)日：2021-11-09

申请号：US16651861

申请日：2018-11-13

Applicant: InterDigital VC Holdings, Inc.

Inventor： Edouard Francois ,  Fabrice Leleannec ,  Philippe De Lagrange

IPC: H04N7/12 ,  H04N19/61 ,  H04N19/126 ,  H04N19/157 ,  H04N19/176 ,  H04N19/189 ,  H04N19/44 ,  H04N19/12 ,  H04N19/645

Abstract: When a 2D separable transform is used in video encoding and decoding, two 1D quantization matrices (QMs) are designed based on the horizontal transform and vertical transform of the 2D separable transform. The choice of a 1D QM can be based on whether the horizontal or vertical transform is transform skip, or based on the type of horizontal or vertical transform. Then a 2D QM can be obtained from the product of those two 1D QMs. In a different implementation, an initial 2D QM may be modified based on the 1D QMs. The 2D QMs can be pre-computed and stored in a look-up table for the encoder and decoder. During quantization and de-quantization, the 2D QM to be used for a block can be computed on the fly or retrieved from the look-up table based on the 2D separable transform that is used for the block.

公开(公告)号：US20240223761A1

公开(公告)日：2024-07-04

申请号：US18402004

申请日：2024-01-02

Applicant: InterDigital VC Holdings, Inc.

Inventor： Philippe De Lagrange ,  Philippe Bordes ,  Edouard Francois

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/186

CPC classification number: H04N19/124 ,  H04N19/176 ,  H04N19/186

Abstract: An image is split into a plurality of blocks of various sizes and a subdivision level counter is associated to each of the blocks. The value of this subdivision level counter for a block is representative of the size of the block and is used to determine the quantization parameter for the block. The value is propagated for each subdivision and incremented according the type of the subdivision. When the image is split, an analysis is done according to the subdivision level counter, a maximal value of subdivision and the type of split, in order to determine the start of a new quantization group and when it is the case, the current position of the partition is propagated to the further split partitions to be stored with these partition and serve in the prediction process when decoding.

公开(公告)号：US20230336775A1

公开(公告)日：2023-10-19

申请号：US18211466

申请日：2023-06-19

Applicant: InterDigital VC Holdings, Inc,

Inventor： Philippe Bordes ,  Fabrice Leleannec ,  Tangi Poirier ,  Philippe De Lagrange

IPC: H04N19/577 ,  H04N19/176 ,  H04N19/44 ,  H04N19/70

CPC classification number: H04N19/577 ,  H04N19/176 ,  H04N19/44 ,  H04N19/70

Abstract: A decoding method is presented. At least one high level syntax element is decoded that indicates whether generalized bi-prediction applies for predicting blocks of a slice. A block is then decoded from said slice using generalized bi-prediction in the case where said at least one high level syntax element indicates to apply generalized bi-prediction.

公开(公告)号：US11558611B2

公开(公告)日：2023-01-17

申请号：US17311510

申请日：2019-12-10

Applicant: InterDigital VC Holdings, Inc.

Inventor： Philippe Bordes ,  Franck Galpin ,  Philippe De Lagrange

IPC: H04N7/12 ,  H04N19/117 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/82 ,  G06T9/00 ,  H04N19/189 ,  H04N19/635

Abstract: Different implementations are described, particularly implementations for video encoding and decoding are presented including a method for deblocking an image. According to an implementation, in a method for deblocking an image, at least one boundary is determined between a first block of samples and a second block of samples; a boundary strength is determined according to at least one of a prediction mode of the first block and a prediction mode of the second block; and samples of the first and second blocks neighboring the at least one boundary are filtered according to the boundary strength. Advantageously, in case the prediction mode of the first block is a weighted prediction mode, the boundary strength further depends on the relative weight of samples used in predicting the first block of samples according to the weighted prediction mode of the first block and reciprocally for the second block.

公开(公告)号：US11729417B2

公开(公告)日：2023-08-15

申请号：US17280218

申请日：2019-10-01

Applicant: InterDigital VC Holdings, Inc.

Inventor： Philippe Bordes ,  Fabrice Leleannec ,  Tangi Poirier ,  Philippe De Lagrange

IPC: H04N19/577 ,  H04N19/176 ,  H04N19/44 ,  H04N19/70

CPC classification number: H04N19/577 ,  H04N19/176 ,  H04N19/44 ,  H04N19/70

Abstract: A decoding method is presented. At least one high level syntax element is decoded that indicates whether generalized bi-prediction applies for predicting blocks of a slice. A block is then decoded from said slice using generalized bi-prediction in the case where said at least one high level syntax element indicates to apply generalized bi-prediction.

公开(公告)号：US20220060743A1

公开(公告)日：2022-02-24

申请号：US17280218

申请日：2019-10-01

Applicant: InterDigital VC Holdings, Inc.

Inventor： Philippe Bordes ,  Fabrice Le Leannec ,  Tangi Poirier ,  Philippe De Lagrange

IPC: H04N19/577 ,  H04N19/70 ,  H04N19/44 ,  H04N19/176

Abstract: A decoding method is presented. At least one high level syntax element is decoded that indicates whether generalized bi-prediction applies for predicting blocks of a slice. A block is then decoded from said slice using generalized bi-prediction in the case where said at least one high level syntax element indicates to apply generalized bi-prediction.